Population dynamics of Glaucomys sabrinus and Tamiasciurus douglasii in old-growth and second-growth stands of coastal coniferous forest

2003 ◽  
Vol 33 (4) ◽  
pp. 587-596 ◽  
Author(s):  
Douglas B Ransome ◽  
Thomas P Sullivan
Keyword(s):  
Population Dynamics ◽  
Habitat Preferences ◽  
Coniferous Forest ◽  
Glaucomys Sabrinus ◽  
Old Growth ◽  
Flying Squirrels ◽  
Survival Percentage ◽  
Second Growth ◽  
Northern Flying Squirrels ◽  
Population Breeding

Habitat preferences and population dynamics of northern flying squirrels (Glaucomys sabrinus Shaw) and Douglas squirrels (Tamiasciurus douglasii Audubon and Bachman) were examined in old-growth and mature second-growth stands in British Columbia, Canada. Using mark–recapture techniques to estimate population dynamics, we tested the hypothesis that old-growth stands provided higher-quality habitat than second-growth stands for these species. Populations were monitored in two old-growth and two mature second-growth stands from August 1995 to May 1999. We were unable to detect major differences in movement, density, recruitment, mass of males, survival, percentage of the population breeding, and the duration that individuals remained on the study plots between stand types for G. sabrinus. Similarly, with the exception of recruitment, we were unable to detect major differences in these parameters between stand types for T. douglasii. Recruitment of T. douglasii was higher in second-growth than in old-growth stands. Old-growth stands were not higher-quality habitat than second-growth stands for either species for the period of enquiry and the parameters we measured. We also presented evidence of late fall – early winter breeding for G. sabrinus, as well as seasonal fluctuations in mass and trappability, larger movement by males than females, and the age of some squirrels exceeding 3.5 years.

Characteristics of northern flying squirrel populations in young second- and old-growth forests in western Oregon

1992 ◽  
Vol 70 (1) ◽  
pp. 161-166 ◽  
Author(s):  
Daniel K. Rosenberg ◽  
Robert G. Anthony
Keyword(s):  
Body Mass ◽  
Habitat Associations ◽  
Habitat Characteristics ◽  
Stand Age ◽  
Glaucomys Sabrinus ◽  
Old Growth ◽  
Flying Squirrel ◽  
Flying Squirrels ◽  
Northern Flying Squirrel ◽  
Second Growth

We compared density, sex ratio, body mass, and annual recapture rate of northern flying squirrel (Glaucomys sabrinus) populations in second-growth and old-growth Douglas-fir (Pseudotsuga menziesii) stands in the Oregon Cascade Range. Densities averaged 2.0 and 2.3 squirrels/ha in second- and old-growth stands, respectively. Although densities varied between years within stands, average densities were similar between years. Body mass and annual recapture rate were similar between stand–age classes, although a higher proportion of females was recaptured in subsequent years in second-growth than in old-growth stands. Similarly, there was a higher proportion of females than males in second-growth but not in old-growth stands. Squirrel densities were not correlated with habitat characteristics; we concluded that flying squirrels may be habitat generalists, and not a species associated with old-growth stands, as was previously hypothesized. We suggest that studies be carried out with radiotelemetry to more accurately assess the habitat associations of this species.

Modeling impacts of landscape connectivity on dispersal movements of northern flying squirrels (Glaucomys sabrinus griseifrons)

2019 ◽  
Vol 394 ◽  
pp. 44-52 ◽  
Author(s):  
Stephanie E. Trapp ◽  
Casey C. Day ◽  
Elizabeth A. Flaherty ◽  
Patrick A. Zollner ◽  
Winston P. Smith
Keyword(s):  
Landscape Connectivity ◽  
Glaucomys Sabrinus ◽  
Flying Squirrels ◽  
Northern Flying Squirrels

Corrigendum to “Influence of forest structure and experimental green-tree retention on northern flying squirrels (Glaucomys sabrinus) abundance” [Forest Ecol. Manage. 285 (2012) 187–194]

2014 ◽  
Vol 312 ◽  
pp. 293
Author(s):  
Gillian L. Holloway ◽  
Winston P. Smith ◽  
Charles B. Halpern ◽  
Robert A. Gitzen ◽  
Christine C. Maguire ◽  
...  
Keyword(s):  
Forest Structure ◽  
Glaucomys Sabrinus ◽  
Flying Squirrels ◽  
Northern Flying Squirrels ◽  
Tree Retention ◽  
Green Tree Retention

Differences in trapping mortality rates of northern flying squirrels

1993 ◽  
Vol 71 (3) ◽  
pp. 660-663 ◽  
Author(s):  
Daniel K. Rosenberg ◽  
Robert G. Anthony
Keyword(s):  
Mortality Rates ◽  
Differential Mortality ◽  
Glaucomys Sabrinus ◽  
Adult Males ◽  
Extrinsic Factors ◽  
Age Cohorts ◽  
Flying Squirrels ◽  
Northern Flying Squirrel ◽  
Northern Flying Squirrels ◽  
Juvenile Males

We described trapping mortality rates of northern flying squirrel (Glaucomys sabrinus) populations in western Oregon, U.S.A., and evaluated the effects of sex, age, body mass, and number of times an individual was recaptured on these rates. Although the overall trapping mortality rates were relatively low (7%) during 16–21 day trapping sessions, we observed differential mortality rates among the sex and age cohorts. The order of mortality rates was: juvenile females (32.3%) > juvenile males (11.1%) > adult females (5.1%) = adult males (4.1%). Overall trapping mortality rates were not affected by the number of times an individual was captured. We hypothesize that the differences we found were due to extrinsic factors (weather-related) acting on differential behavioral responses to trapping and thresholds of stress an animal can tolerate.

Den trees used by northern flying squirrels (Glaucomys sabrinus) in southeastern Alaska

2002 ◽  
Vol 80 (9) ◽  
pp. 1623-1633 ◽  
Author(s):  
V J Bakker ◽  
K Hastings
Keyword(s):  
Small Groups ◽  
Random Trees ◽  
High Rate ◽  
Limiting Factor ◽  
Glaucomys Sabrinus ◽  
Flying Squirrel ◽  
Flying Squirrels ◽  
Northern Flying Squirrel ◽  
Den Site Selection ◽  
Northern Flying Squirrels

Northern flying squirrel (Glaucomys sabrinus) dens are reportedly associated with features characteristic of older forests, and den availability is a potential limiting factor in younger forests. We assessed den sites used by northern flying squirrels in southeastern Alaska, where we expected den-site selection to differ from more southerly forests, owing to increased thermal stress but reduced predation and competition. We located 27 squirrels in 76 dens and compared den trees with 1875 matched random trees. Most dens ([Formula: see text]73%) were in cavities and 21% were at heights of [Formula: see text]3 m. This high rate of cavity use, including cavities low in the bole, likely reflects the importance of weatherproof dens in this cool wet region. Northern flying squirrels preferentially used trees with indicators of cavity presence, selecting for snags and for larger diameter trees with bole entries, conks, abundant mistletoe, and dead tops. Although cavity availability is probably not limiting populations in this region currently, cavity-supporting trees would be one of the last elements of old-growth forests to develop in intensively logged stands. Retention of small groups of large snags and live trees exhibiting evidence of disease or physical defects would ensure availability of denning structures after logging.

Winter nest trees of sympatric northern and southern flying squirrels: a test of reinforcement in a hybrid zone

2021 ◽  
Author(s):  
Paul Philip O'Brien ◽  
Jeff Bowman ◽  
Andrea Coombs ◽  
Sasha Newar ◽  
Colin J. Garroway
Keyword(s):  
Secondary Contact ◽  
Glaucomys Sabrinus ◽  
Closely Related Species ◽  
Flying Squirrels ◽  
Hardwood Trees ◽  
Weak Evidence ◽  
Northern Flying Squirrels ◽  
Habitat Suitability Modelling ◽  
Classification Information ◽  
Nest Type

Shifting range boundaries can lead to secondary contact of closely related species, which might in turn lead to hybridization when the evolution of reproductive isolation is incomplete. We examined winter nest use of northern (Glaucomys sabrinus Shaw, 1801) and southern flying squirrels (G. volans Linnaeus, 1758) in an area of recent secondary contact and known hybridization in Ontario, Canada to test for evidence of reinforcement due to different and diverging nesting behaviours. We radio-collared 26 flying squirrels (12 G. sabrinus and 14 G. volans) between two survey periods (winters of 2008-9 and 2019-20) and identified all nest trees used by individuals throughout each winter. For each nest tree we identified the nest type and collected tree classification information to compare differences in nest use between species. We also present a novel application of habitat suitability modelling to test for evidence of divergence in nest use through time, which would suggest reinforcement. We found southern flying squirrels used a higher proportion of cavities in large, hardwood trees, whereas northern flying squirrels used more external nests and softwood trees. Conditional probabilities provided some evidence for increased differentiation in nest use by flying squirrels through time. Overall, we found relatively little overlap in winter nest use between flying squirrel species, despite evidence for hybridization at this site, and some weak evidence for increased divergence between species in nest use over 11 years

scholarly journals Spatial Organization of Northern Flying Squirrels,Glaucomys sabrinus: Territoriality in Females?

2011 ◽  
Vol 71 (1) ◽  
pp. 44-48 ◽  
Author(s):  
Jaya R. Smith ◽  
Dirk H. Van Vuren ◽  
Douglas A. Kelt ◽  
Michael L. Johnson
Keyword(s):  
Spatial Organization ◽  
Glaucomys Sabrinus ◽  
Flying Squirrels ◽  
Northern Flying Squirrels
Sign in / Sign up

Export Citation Format

Share Document